ES2331319T3 - IMPROVED PRODUCT THAT CAN TRANSFORM A CORROSIVE OR HARMFUL TOXIC LIQUID PRODUCT FOR THE ENVIRONMENT IN A NON-AGGRESSIVE OR NON-HARMFUL WASTE. - Google Patents

Abstract

The invention relates to a product for transformation of a toxic corrosive or environmentally-noxious product into a non-corrosive or non-noxious residue, comprising at least one amphoteric agent, at least one lipophilic absorbent, at least one hydrophilic absorbent and at least one binary colored indicator, selected from the group of the following mixtures: Nile blue/alizarin red, alizarin yellow/alizarin red, thymolphthalein/methyl red, phenolphthalein/methyl red and tropaeolin OO/thymol blue and optionally an additive selected from the group comprising charge agents, granulation agents, anti-static agents and mixtures thereof.

Description

Improved product that can transform a toxic liquid product corrosive or harmful to the environment environment in a non-aggressive or non-harmful residue.

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Technical sector

The present invention relates to a product improved that can transform a corrosive toxic liquid product or harmful to the environment in a non-aggressive waste or not harmful.

State of the art

Such products, also called products of neutralization, have been described in patents FR2784589 and EP995492. Although they are very effective, they do not allow to know if the product Toxic spillage is completely neutralized. Therefore the user has a tendency to increase product doses of neutralization so that it ensures that the residue can handle safely or you have to perform a measurement of the pH of the residue.

In the market there are products of acid neutralization and base neutralization products that  they are equipped with a color indicator that allows immediate identification of the pH zone of the residue.

These products are, for example, products marketed by the company HALECO with the brands Neutrabase® and Neutracide®.

However, these products have an action of specific neutralization. Therefore, they can only be used when The nature of the spilled product is known. Also, for the Neutrabase® product if the base to be neutralized is too much strong, the color indicator is no longer reliable, or else it retains the basic coloring even if neutralization has been achieved or does not fulfill its function, that is, no change of color.

Regarding the function of the color indicator of the Neutracide® product, it is canceled if the acid that is going to neutralized is 98% sulfuric acid.

Therefore, the choice of a pH indicator for relatively simple products such as the products of monofunctional neutralization such as Neutracide® or Neutrabase® It presents a problem.

In addition, it is often difficult to know the nature of the liquid product that has been spilled, this being rarely a pure product, but rather an indefinite mixture of toxic or harmful products for the environment.

Therefore, there is a real need for a multifunctional product, that is, to neutralize both acids as bases, but also oxidants, reducers, oils and / or fats, equipped with an indicator of pH

The present inventors have found that a multifunctional product, that is, a product such as described in patents FR2784589 and EP995492, to which a mixture is added specific to two color indicators, responded to all these requirements.

Object of the invention

Thus, the present invention relates to a product that can transform a toxic, corrosive liquid product or harmful to the environment in a non-aggressive waste or not harmful, comprising:

- at least one amphoteric chosen in such a way that:

- the pH of the residue obtained is in the range of 5 to 10, preferably 5.5 to 9.7,

- the lowest of the amphoteric acid pKs is in  the range of 5 to 10, preferably 5.5 to 9.7, and the largest of the basic pK of the amphoteric is chosen in the range of 5 to 10, preferably from 5 to 8,

- the largest of the basic pK of the amphoteric is less than the least of the acidic pKs,

- at least one lipophilic absorbent,

- at least one hydrophilic absorbent, and

- at least one chosen binary color indicator  from the group consisting of the following mixtures, blue of Nizar / alizarin red, alizarin yellow / alizarin red, thymolphthalein / methyl red, phenolphthalein / methyl red and tropaeolin OO / thymol blue, and

- possibly additives chosen from the group that comprises loading agents, granulation agents, agents antistatic and their mixtures.

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In the present invention, they will be used indifferently the expressions "mixture of two indicators of color "or" binary color indicator "or" color indicator color".

"Liquid product" means any product that has a liquid consistency, semi-liquid, semi-pasty or pasty. According to one embodiment advantageous of the invention, the binary color indicator is a thymolphthalein / methyl red mixture, preferably a mixture in the proportions of 75/25 to 25/75, preferably 50/50 p / p.

The amount of color indicator in the product  of the invention should be sufficient for changes in Coloring are very visible. However, it is understood that this Amount is limited by the high cost of dyes.

Properly, the product according to the invention comprises from 0.01% to 10% by weight of color indicator, preferably from 0.05% to 5% and even more preferably from 0.01% to 0.5% by weight.

According to an advantageous embodiment of the invention, the product comprises at least two amphoteric in proportions such that the ratio of the sum of the number of moles of amphoteric that have an acidic pK in the range of 5 to 10 and preferably from 5.5 to 9, 7, with respect to the sum of the number of moles of amphoteric that have a basic pK in the range of 5  to 10, and preferably 5 to 8 is between 0.1 and 10.

Remember that an amphoteric is a substance or an ion that can play both the role of an acid and the paper of a base. Therefore, it presents at least two constants of dissociation (pK), one corresponding to the acid function, and another to The basic function.

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More precisely, the product of the The invention includes, in addition to the color indicator:

- 20 to 60% by weight, preferably 15 at 55%, and even more preferably from 10 to 45% by weight of at less an amphoteric,

- 2 to 20% by weight, preferably 2 to 2  15%, and even more preferably 1 to 10% by weight, of at less a lipophilic absorbent,

- 2 to 20% by weight, preferably 2 to 2  15%, and even more preferably 1 to 10% by weight, of at less a hydrophilic absorbent,

- 0 to 5% by weight, preferably 0.1 1% by weight of additives.

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In most cases, at least two different amphoteric, of which one has an acidic pK and the another presents a basic pK that respond to the indicated requirements above and that will be named for convenience below "anti-base amphoteric" and "amphoteric anti-acid "respectively.

Preferably, the amphoteric anti-base and anti-acid amphoteric are not conjugates, that is to say that one does not give rise to the other by means of a acid-base reaction.

As anti-base amphoteric and anti-acid amphoteric can be used those described in the patents FR86 11754, FR86 11754, FR86 140042 on behalf of the applicant. In in particular, amphoteric chosen from the group that comprises: amino acids such as glycine, alanine, serine, glutamine, lysine, alanylalanine, histidine, L-histidyl-histidine, arginilarginine and its mixtures, sodium bicarbonate, edetate episode, disodium citrate.

The product according to the invention may comprise only a single amphoteric, with the condition that present by a part an acid pK and on the other hand a basic pK that respond to conditions mentioned above.

As an amphoteric of this type, the  L-histidyl-histidine and the arginilarginine

The lipophilic absorbent is an absorbent product or superabsorbent, which is a polymer such as polyisonorbornene, especially the one sold under the name NORSOREX APX1 of the company ATOCHEN, or even the OIL ABSORBER products of the SNF FLOERGER, GAMSORB company of GAMLEN INDUSTRIES SA, RHON'SEC granulated from the company TOLSA FRANCE SA, and its mixtures

The hydrophilic absorbent is chosen from the group that comprises absorbents or superabsorbents, especially those Acrylic polymers such as NORSOCRYL S35 from ELF ATOCHEN and the products marketed with the denominations AQUALIC® LAW45 of the company BASF, ASAP 2000 and ASAP 2003 of the company CHEMDAL LTD., FAVOR Z1030 of the company STOCKHAUSEN, DRYTECH 4535R of the company DOW CHEMICALS, AQUASORB 3005K1 of the SNF FLOERGER company, RHON'SEC granulated company TOLSA FRANCE SA, and its mixtures.

The product according to the invention is colored white to pale yellow. When the indicator is a mixture of Thymolphthalein / methyl red, this product turns blue when It is basic and red when it is acidic.

The product according to the invention is presented in form of powder, granules, tablets or products conditioned in containers, specially constituted by mesh of plastic or non-woven material, of shapes and dimensions appropriate so that plates or rolls are obtained for example that facilitate the application of the product.

For product application according to invention, sometimes the addition of a certain water amount. This is especially the case when the liquid Pouring is a strong acid. Indeed, since it only contains very little water, it may be necessary to add it with the so that the neutralization reaction is complete.

When the product according to the invention is applied on the liquid to be treated, it turns blue if it is basic and red if acidic (when the indicator is thymolphthalein / red of methyl), swells and solidifies, then it is white / yellow. Then a more or less compact solid residue is obtained according to the  nature of the toxic, corrosive or harmful liquid discharged. Then this solid residue can be easily removed with help for example a scraper, a brush, a shovel without risk of burns or irritation for the operator.

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Detailed description of the invention

The invention will now be described in more detail.  with the help of the following non-limiting examples, which They provide purely illustrative purposes.

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Examples

In the examples the following are used denominations:

NORSOCRYL S35: lipophilic absorbent marketed by the company ATOCHEM.

NORSOREX APX1: hydrophilic absorbent marketed by the company ATOCHEM.

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Example 1 Use of a product according to the invention on hydroxide of potassium

The product according to the invention is a powder white with the following composition:

- 322 g of ammonium chloride,

- 393.4 g boric acid,

- 83.3 g of NORSOCRYL S35,

- 83.3 g of NORSOREX APX1,

- 200 mg thymolphthalein / methyl red (50/50).

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100 ml is poured onto a laboratory table of potassium hydroxide (KOH) having the indicated concentration in table 1 below. Then the white powder is poured into the amounts indicated in table 1, first around of the liquid mass and then over the entire surface.

The dust swells turning blue and it solidifies, then, little by little, the residue formed loses its Blue color and turns raw white. A pH check with pH paper aid shows that the residue that has been neutralized, It has a pH between 5.5 and 9.7. Therefore it can be discarded without concern.

TABLE 1

one

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Example 2 Determination of color indicators that may be used

The following indicators were chosen different as an indicator that could potentially be used for product of the invention.

dye 1: Nile blue / methyl orange (50/50)

dye 2: fluorescein

dye 3: soda fluorescein / thymolphthalein (50/50)

dye 4: Nile blue / alizarin red (50/50)

dye 5: alizarin yellow / red Alizarin (56/44)

dye 6: thymolphthalein / tropaeoline OO (80/20)

dye 7: phenolphthalein / tropaeoline OO (80/20)

dye 8: phenolphthalein / methyl red (66/33)

dye 9: phenolphthalein / methyl red (80/20)

dye 10: methyl red / yellow Alizarin (66/33)

dye 11: thymolphthalein / methyl red (76/24)

dye 12: thymolphthalein / methyl red (50/10)

dye 13: thymolphthalein / methyl red (66/33)

dye 14: thymolphthalein / methyl red (50/50)

dye 15: tropaeolin OO / thymol blue (66/33)

dye 16: tropaeolin OO / thymol blue (50/50)

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A first series of tests were tested. dyes alone, the basic and acid turns were verified. The Results are given in table 2 below:

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TABLE 2

2

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As can be deduced from this table, only dyes 8, 12 and 15 provide satisfactory results in As for the color change, when used alone.

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Products according to the invention were prepared mixing the dyes indicated in table 3 below with Product A that had the following composition:

440.1 g of sodium bicarbonate,

393.4 g of glycine,

83.3 g of NORSOCRYL S35,

83.3 g of NORSOREX APX1,

and the basic and acid turns were verified. The  Results are given in table 3 below.

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The amount mentioned in this table corresponds to the amount of dye in mg / g of Product A.

TABLE 3

3

From table 3 it follows that only dyes 5, 9 and 11-14 can be used validly. The most appropriate dyes are the dyes 11-14.

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References cited in memory

This list of references cited by the applicant is directed only to help the reader and not form part of the European patent document. Even if you have tried the greatest care in its conception, errors cannot be excluded or omissions and the OEB declines all responsibility to this respect.

Patent documents mentioned in the report

FR 2784589 (0002) (0010)

FR 8611754 (0022) (0022)

EP 995492 A (0002) (0010)

FR 86140042 (0022)

Claims (10)

1. Product comprising: - at least one amphoteric chosen so that: - the pH of the residue obtained is in the range of 5 to 10, preferably 5.5 to 9.7, - the lowest of the amphoteric acid pKs is in the range of 5 to 10, preferably 5.5 to 9.7, and the largest of the basic pK of the amphoteric is chosen in the range of 5 to 10, preferably from 5 to 8, - the largest of the basic pK of the amphoteric is less than the least of the acidic pK, - at least one lipophilic absorbent, - at least one hydrophilic absorbent, and - possibly at least one additive chosen from group comprising loading agents, granulation agents, antistatic agents and mixtures thereof, characterized by the presence of at least one binary color indicator chosen from the group consisting of the following mixtures, Nile blue / alizarin red, alizarin yellow / alizarin red, thymolphthalein / methyl red, phenolphthalein / methyl red and tropaeoline OO / thymol blue.

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2. Product according to claim 1, characterized in that the binary color indicator is a mixture of thymolphthalein / methyl red. 3. Product according to claim 1 or claim 2, characterized in that the binary indicator is a mixture of 75/25 (w / w) to 25/75 (w / w), preferably 50/50 (w / p). 4. Product according to any one of claims 1 to 3, characterized in that the product comprises from 0.01% to 10% by weight of indicator, preferably from 0.05% to 5% and even more preferably from 0 , 01% to 0.5% by weight. 5. Product according to any one of claims 1 to 4, characterized in that it comprises at least two amphoteric in proportions such that the ratio of the sum of the number of moles of the amphoteric having an acidic pK in the range of 5 to 10 and preferably 5.5 to 9.7, with respect to the sum of the number of moles of the amphoteric having a basic pK in the range of 5 to 10, and preferably 5 to 8, is between 0, 1 and 10

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6. Product according to any one of claims 1 to 5, characterized in that it comprises, in addition to the color indicator: - 20 to 60% by weight, preferably 15 at 55% by weight, and even more preferably from 10 to 45% by weight of at least one amphoteric, - 2 to 20% by weight, preferably 2 at 15% by weight, and even more preferably from 1 to 10% by weight, of at least one lipophilic absorbent, - 2 to 20% by weight, preferably 2 at 15% by weight, and even more preferably from 1 to 10% by weight, of at least one hydrophilic absorbent, - 0 to 5% by weight, preferably 0.1 at 1% by weight of at least one additive.

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7. Product according to any one of claims 1 to 6, characterized in that the amphoteric is selected from the group comprising amino acids such as glycine, alanine, serine, glutamine, lysine, alanylalanine, histidine, L-histidylhistidine, arginilarginine and mixtures thereof, sodium bicarbonate, trisodium edetate and disodium citrate, preferably L-histidylhistidine or arginilarginine. 8. Product according to any one of the claims 1 to 7, wherein the lipophilic absorbent is a polymer such as polyisonorbornene, especially the marketed under the company NORSOREX APX1 designation ATOCHEN, or even OIL ABSORBER products from SNF FLOERGER, GAMSORB of the company GAMLEN INDUSTRIES SA, RHON'SEC granulate of the company TOLSA FRANCE SA, and its mixtures, and in the that the hydrophilic absorbent is chosen from the group comprising especially acrylic polymers such as NORSOCRYL S35 of the ELF ATOCHEN company and the products marketed with the AQUALIC® LAW45 designations of BASF, ASAP 2000 and ASAP 2003 of the company CHEMDAL LTD., FAVOR Z1030 of the company STOCKHAUSEN, DRYTECH 4535R of the company DOW CHEMICALS, AQUASORB 3005K1 of the company SNF FLOERGER, RHON'SEC granulated company TOLSA FRANCE SA. 9. Product according to any one of claims 1 to 8, characterized in that it is white to pale yellow. 10. Product according to any one of claims 1 to 9, characterized in that it is presented in the form of powder, granules, tablets or packaged products, especially constituted by mesh of plastic or non-woven material , of appropriate shapes and dimensions so as to obtain, for example, plates or rolls that facilitate the application of the product.